• 제목/요약/키워드: 마찰용접

검색결과 464건 처리시간 0.025초

2024 알루미늄 합금의 마찰교반용접 특성 (The joints properties of Friction stir welded Al 2024 alloy)

  • 김선규;이창용;이원배;연윤모;정승부
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2004년도 춘계 학술발표대회 개요집
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    • pp.165-167
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    • 2004
  • 마찰교반접합(FSW, Friction Stir Welding)은 영국 TWI에 의해 1991년에 개발되어 특허가 출원된 후 90년대 중반부터 산업에 적용되었으며, 짧은 시간동안에 실용화가 이루어졌다. 이 기술이 적용되기 전, Al 합금의 접합은 MIG(Metal Inert Gas)나 TIG(Tungsgten Inert Gas)와 같은 접합이 주로 이용되어 왔으나, 이들 접합기술은 접합부의 표면문제, 변형, 결함 등으로 인하여 Al 합금의 구조물 적용에 큰 문제점이 야기되어왔다. (중략)

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고속도강과 탄소공구강의 마찰용접 및 AE 평가 (Friction welding of high speed steel to carbon steel and AE evaluation)

  • 이원석;윤인진;전태언;오세규
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 1995년도 특별강연 및 춘계학술발표 개요집
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    • pp.114-117
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    • 1995
  • A study of friction welding of high speed steel(SKH51) bar for blade side to carbon steel(STC3) bar for shank side was carried out experimentally through tensile test, hardness lest, microstructure, and acoustic emission (AR) test. So, this paper deals with optimizing the welding conditions and the real-time quality(strength) evaluation of friction welded joints by acoustic emission technique.

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비파괴검사에 의한 A2024 마찰교반용접부의 건전성 평가 (Soundness evaluation of friction stir welded A2024 alloy by non-destructive test)

  • 고영봉;김기범;박경채
    • Journal of Advanced Marine Engineering and Technology
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    • 제37권2호
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    • pp.135-143
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    • 2013
  • 마찰교반용접은 운송 분야 등에서 널리 상업화되고 있다. 본 연구는 마찰교반용접된 A2024-T4 합금의 결함을 비파괴검사(방사선투과검사, 초음파탐상시험, 전기전도도시험)와 파괴시험(인장강도 및 미세조직 관찰)을 실시하여 관찰하였다. 실험 결과 결함 분포도를 얻을 수 있었다. 방사선투과검사에서 발견되지 않은 미세결함이 초음파탐상시험에서는 발견되었으며, 초음파탐상시험은 음압의 차이와 그에 대응하는 색에 의해 결함의 정도를 검사할 수 있는 효과적인 방법이었다. 또한 전기전도도 측정값은 결함의 양이 많아짐에 따라 감소하는 경향을 보였다. 비파괴검사와 파괴검사를 통해 얻은 가장 건전한 조건의 이음 효율은 91% 이었다. 따라서 비파괴검사는 마찰교반용접된 A2024-T4 합금을 검사하는데 있어서 효과적인 방법이라 사료된다.

A2024-T4 마찰용접(摩擦熔接)시 반경 변화에 따른 기계적(機械的) 성질(性質) 연구(硏究) (A Study on Mechanical Properties According to the Radius Change Position of Outer Circumference in A2024-T4 Friction Welding)

  • 박근형;민택기
    • 한국공작기계학회논문집
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    • 제16권3호
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    • pp.109-116
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    • 2007
  • The present study examined mechanical properties according to the change of outer circumference in the friction welding of A2024-T4 stock, which is used much as aircraft structure, truck wheel, stainless materials and A2024-T4 stock with 10 hollow at the center. Welding conditions were fixed at RPM 2,000rpm, friction pressure of 50MPa, friction time of 1.5sec, upset pressure of 120MPa and upset time of 2.0 seconds. From the result of this study were drawn conclusions as follows : According to the result of a tensile strength test, the solid shaft showed linear increase of tensile strength with the change of outer circumference, the hollow shaft showed maximum tensile stength when the length (L) was 2mm and decrease of tensile strength with the change of outer circumference, hardness appeared to increase and then decrease for welding interface, and it showed maximum hardness 155Hv at L=5mm of the solid shaft. Bending strength increased linearly far change of the distance (L) of outer circumference in the solid shaft and then decreased linearly in the hollow shaft. the result of examining tissue, the tissue grew finer around the welding interface and divided the basic material and the welding surface.

무산소동의 마찰 용접 특성에 관한 연구 (Study on the Frition Welding Characteristics of Oxygen Free High Conductivity Copper)

  • 정호신;소전강
    • 한국해양공학회지
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    • 제11권1호
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    • pp.10-15
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    • 1997
  • Copper and its alloy had been used widely because of its pronouncing characteristics on their high thermal and electrical conductivity. Various fusion welding methods, such as SMAW, SAW, GTAW, GMAW, Electroslag welding amd so on are applied to weld copper and its alloy. But fusion welding of copper has so many welding problems. THe most serious problems were poor penetration amd high thermal contration stress due to its high thermal conductivity and porosity could be formed by rapid cooling rate of fusion welding. In order to avoid such fusion welding problems, preheating, peering and heat treatment must be applied to obtain sound weld joint of copper. But preheating induce another welding problem such as grain coarsening of weld heat affected zone. This grain coarsening reduces ductility and strength of weld joint. In this view of point, friction welding of copper is triedm to obtain sound weld joint of copper by reducing metallurgical problems. This study introduced new concept of heat input for evaluating the friction weldability of copper. As a result, weldability of copper could be evaluated by this new concept of heat input.

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